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Coated magnesium alloy bone nails, bone plates and cancellous bone screws and preparation method thereof

A technology of magnesium alloy and cancellous bone, which is applied in the fields of coating, metal material coating technology, medical science, etc., and can solve the problems that fluoroapatite coating has not been reported.

Active Publication Date: 2015-05-20
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the research status at home and abroad, Mg-3wt%Zn-M (M= Zr, Sr, Ca, Ag) alloy is currently used in the processing of bone nails, bone plates and cancellous bone screws, and it is treated with HF acid aqueous solution The method and process of obtaining fluoroapatite coating by two-step treatment with Ca and P solutions have not been reported yet

Method used

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  • Coated magnesium alloy bone nails, bone plates and cancellous bone screws and preparation method thereof
  • Coated magnesium alloy bone nails, bone plates and cancellous bone screws and preparation method thereof
  • Coated magnesium alloy bone nails, bone plates and cancellous bone screws and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] A coated magnesium alloy bone nail and bone plate, the magnesium alloy is composed of Mg, Zn, and Zr with a purity greater than 99.99 wt.%, and the mass percentage of each component is: Zn is 3%, Zr is 0.6%, and Mg Is the margin.

[0024] The preparation method of the coated magnesium alloy bone nail and bone plate includes the following steps:

[0025] 1) Put Mg, Zn and Mg-30 wt.% Zr master alloy into the graphite crucible and vacuumize to 1×10 -2 Pa, pass argon protection, heat to 780°C and keep it warm for 20 minutes, then fully stir at 8r / s for 8 minutes and then start to cool down. After the temperature drops to 650°C, pour into the crystallizer to obtain a round ingot with a diameter of 40mm;

[0026] 2) Put the above round ingot in an air furnace, homogenize and anneal at 300℃ for 36h, then heat it up to 510℃ for 2h, then quench it into 30-50℃ warm water;

[0027] 3) Perform hot extrusion at a temperature of 300°C, rectangular cross-section exit die extrusion plate, roun...

Embodiment 2

[0033] A coated magnesium alloy cancellous bone screw, the magnesium alloy is composed of Mg, Zn, and Zr with a purity greater than 99.99 wt.%, and the mass percentage of each component is: Zn is 3%, Zr is 0.6%, and Mg is margin.

[0034] The preparation method of the coated magnesium alloy cancellous bone screw includes the following steps:

[0035] 1) Put Mg, Zn and Mg-30 wt.% Zr master alloy into the graphite crucible and vacuumize to 1×10 -2 Pa, pass argon protection, heat to 780°C and keep it warm for 20 minutes, then fully stir at 8r / s for 8 minutes and then start to cool down. After the temperature drops to 650°C, pour into the crystallizer to obtain a round ingot with a diameter of 40mm;

[0036] 2) Put the above round ingot in an air furnace, homogenize annealing at 300℃ for 36h, then heat to 510℃ for 2h, then quench into 30-50℃ warm water;

[0037] 3) Perform hot extrusion at 300°C with an extrusion ratio of 48 to obtain magnesium alloy bars. The extruded alloy has a tensile...

Embodiment 3

[0043] A coated magnesium alloy bone nail and bone plate, the magnesium alloy is composed of Mg, Zn, Zr, and Ca with a purity greater than 99.99 wt.%, and the mass percentage of each component is: Zn is 3%, Zr is 0.6% , Ca is 0.1%, Mg is the balance.

[0044] The preparation method of the coated magnesium alloy bone nail and bone plate includes the following steps:

[0045] 1) Put Mg, Zn and Mg-30 wt.% Zr, Mg-30 wt.%Ca master alloy into the graphite crucible, and vacuum to 1×10 -2 Pa, pass argon protection, heat to 780°C and keep it warm for 20 minutes, then fully stir at 8r / s for 8 minutes and then start to cool down. After the temperature drops to 650°C, pour into the crystallizer to obtain a round ingot with a diameter of 40mm;

[0046] 2) Put the above round ingots in an air furnace, homogenize and anneal at 300℃ for 36h, then heat up to 510℃ for solid solution for 3h, then quench into 30-50℃ warm water;

[0047] 3) Perform hot extrusion at a temperature of 300°C, rectangular cros...

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Abstract

The invention discloses coated magnesium alloy bone nails, bone plates and cancellous bone screws. The magnesium alloy consists of Mg of which the purity is more than 99.99wt%, Zn and adding elements, wherein the adding elements refer to one, two or three in Zr, Sr, Ca and Ag; and the magnesium alloy comprises the following components in percentage by mass: 3 percent of Zn, 0.2-1.0 percent of Zr, 0-1.0 percent of Sr, 0-1.0 percent of Ca, 0.0-1.0 percent of Ag and the balance of Mg. The coated magnesium alloy bone nails, bone plates and cancellous bone screws have the advantages that after being subjected to comprehensive treatment, the magnesium alloy bone nails, bone plates and cancellous bone screws have reasonable degradation rate, capacity of promoting new bone growth in the living body and high biocompatibility; particularly, after the bone nails, bone plates and cancellous bone screws are treated by the mixed aqueous solution of hydrofluoric acid and calcium and phosphorus compounds, the corrosion rate can be regulated by virtue of the thickness of the surface fluorides and fluorapatite layer, and the requirement on rigid fixation time of the bone nails, bone plates and cancellous bone screws before internal fracture fixation within 3 months can be met.

Description

Technical field [0001] The invention relates to a processing and processing technology of a degradable and absorbing magnesium alloy product for internal fixation of fractures, in particular to a coated magnesium alloy bone nail, bone plate and cancellous bone screw and a preparation method thereof. Background technique [0002] Magnesium alloy has a huge application prospect in the field of biodegradable medical implant materials due to its unique and excellent physical and chemical properties. Compared with other medical metals, the modulus of elasticity of magnesium alloy is about 40 GPa, which is only 2-3 times that of human bone, which is much lower than the existing metals such as stainless steel and titanium alloy. Therefore, after magnesium alloy implantation, the stress shielding effect will be greatly reduced, and it has good mechanical compatibility with bone tissue. The uniqueness of magnesium alloy lies in its degradable characteristics. Magnesium alloy produces Mg...

Claims

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Application Information

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IPC IPC(8): A61L31/02A61L31/08A61L31/14C22C23/04C23C22/22
Inventor 陈民芳李祯姜舒婷由臣刘德宝
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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